/*
 * Created on May 29, 2014
 * Created by Paul Gardner
 * 
 * Copyright 2014 Azureus Software, Inc.  All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License only.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package com.aelitis.azureus.core.dht.transport.udp.impl;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.gudy.azureus2.core3.util.BDecoder;
import org.gudy.azureus2.core3.util.SystemTime;

import com.aelitis.azureus.core.dht.transport.DHTTransportAlternativeContact;

public class DHTTransportAlternativeContactImpl implements DHTTransportAlternativeContact {
    private final byte network_type;
    private final byte version;
    private final short initial_age;
    private final byte[] encoded;

    private final int id;

    private final int start_time = (int) (SystemTime.getMonotonousTime() / 1000);

    protected DHTTransportAlternativeContactImpl(byte _network_type, byte _version, short _age, byte[] _encoded) {
        network_type = _network_type;
        version = _version;
        initial_age = _age < 0 ? Short.MAX_VALUE : _age;
        encoded = _encoded;

        id = Arrays.hashCode(encoded);
    }

    public int getNetworkType() {
        return (network_type & 0xff);
    }

    public int getVersion() {
        return (version & 0xff);
    }

    public int getID() {
        return (id);
    }

    public int getLastAlive() {
        return (start_time - initial_age);
    }

    public int getAge() {
        if (initial_age < 0) {

            return (Short.MAX_VALUE);
        }

        int elapsed = ((int) (SystemTime.getMonotonousTime() / 1000)) - start_time;

        int rem = Short.MAX_VALUE - initial_age;

        if (rem < elapsed) {

            return (Short.MAX_VALUE);

        } else {

            return ((short) (initial_age + elapsed));
        }
    }

    public Map<String, Object> getProperties() {
        try {
            return (BDecoder.decode(encoded));

        } catch (Throwable e) {

            return (new HashMap<String, Object>());
        }
    }
}
